本文關(guān)鍵詞： 遠(yuǎn)程卸壓開采 模擬試驗(yàn) 多關(guān)鍵層 阻隔性與跳躍性 卸壓瓦斯抽采　出處：《安徽理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：淮南礦區(qū)高瓦斯、低透氣性近距離煤層群(B組煤層)在下行卸壓開采過程中卸壓效果差,瓦斯治理難度大,開采成本高。為了探索礦區(qū)深部下保護(hù)層A組煤層開采遠(yuǎn)距離上行卸壓B組煤層的可行性,以潘二礦A3煤11223工作面及B4煤層為工程背景,采用理論分析、實(shí)驗(yàn)室實(shí)驗(yàn)、相似模擬試驗(yàn)以及現(xiàn)場實(shí)測的手段,開展了不同關(guān)鍵層結(jié)構(gòu)下保護(hù)層開采覆巖應(yīng)力場、裂隙場演化規(guī)律和卸壓特征以及關(guān)鍵層破斷對被保護(hù)層卸壓瓦斯涌出動態(tài)影響的研究。首先,基于11223工作面與B4煤層間巖層結(jié)構(gòu)特征,構(gòu)建了工程地質(zhì)模型,結(jié)合巖層物理力學(xué)參數(shù),參照關(guān)鍵層理論計(jì)算得到11223工作面西二段與東一段關(guān)鍵層層數(shù)分別為3層與2層并對巖層進(jìn)行對應(yīng)分組。其次,根據(jù)11223工作面西二段與東一段不同覆巖頂板條件分別構(gòu)建走向與傾向相似材料模擬、UDEC走向數(shù)值模擬,獲得了多關(guān)鍵層條件下遠(yuǎn)程上行卸壓開采采動應(yīng)力場、裂隙場演化特征及B4煤卸壓范圍與卸壓效果。研究表明關(guān)鍵層阻隔裂隙向上發(fā)育,降低B4煤卸壓效果且裂隙發(fā)育高度隨著關(guān)鍵層的破斷"跳躍性"發(fā)展。然后,對現(xiàn)場試驗(yàn)結(jié)果與卸壓瓦斯抽采數(shù)據(jù)進(jìn)行分析,獲得現(xiàn)場應(yīng)力演化特征以及通過卸壓瓦斯抽采量變化反演的現(xiàn)場關(guān)鍵層破斷規(guī)律,認(rèn)為西二段比東一段多一層關(guān)鍵層的巖層結(jié)構(gòu)影響裂隙向上發(fā)育,導(dǎo)致該段卸壓抽采率較低的主要原因。最后,基于以上研究結(jié)果,對11223工作面遠(yuǎn)程上行卸壓開采B4煤卸壓瓦斯抽采系統(tǒng)巷道聯(lián)合布置進(jìn)行優(yōu)化設(shè)計(jì),獲得卸壓瓦斯抽采巷道的布置方案。
[Abstract]:Huainan mining area, high gas, low permeability of short distance coal seam group B coal seam) in the downward pressure relief mining process of pressure relief effect is poor, gas treatment is difficult. The mining cost is high. In order to explore the feasibility of mining long-distance upward pressure relief group B coal seam in deep protection layer A group coal seam, the engineering background is A3 11223 coal face and B 4 coal seam in Paner Coal Mine. By means of theoretical analysis, laboratory experiments, similar simulation tests and field measurements, the stress fields of overburden mining under different key layer structures are carried out. The evolution law and pressure relief characteristics of fracture field and the dynamic influence of key strata breaking on pressure relief gas emission of protected layer are studied. Firstly, based on the structural characteristics of rock layer between 11223 face and B4 coal seam. The engineering geological model is constructed and combined with the physical and mechanical parameters of the strata. According to the key layer theory calculation, the key layers of the west second and east first section of 11223 face are three and two layers, respectively, and the corresponding rock layers are grouped. Secondly. According to the different overburden roof conditions in the west second and east first section of 11223 face, the simulation of the strike and the tendency of the same material is constructed respectively and the numerical simulation of the UDEC strike is carried out. The dynamic stress field, the evolution characteristics of fracture field and the pressure relief range of B4 coal under the condition of multiple critical layers are obtained. The study shows that the key layers block the development of fracture upward. The effect of reducing the pressure relief of B4 coal is reduced and the height of fracture development develops with the breakage of critical layer "jumping". Then, the field test results and pressure relief gas extraction data are analyzed. The characteristics of stress evolution in the field and the breaking rule of the key layer in the field are obtained. It is considered that the rock structure of one more layer in the western second member than in the east section affects the fracture development upward. Finally, based on the above research results, the combined layout of the roadway of B4 coal relief gas extraction system is optimized based on the above research results. The layout scheme of gas drainage roadway is obtained.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD712.6

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